To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.

The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!

In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

Knight boiler problems

Comments

As others have pointed out, please realize that a proper cleaning involves removing all the debris between the sections. As Steve mentioned, a feeler gauge or an old credit card work well. You've got to get out everything in the crevices.

It should also be confirmed that there is proper flow through the water side of the heat ex. and there's no scaling.

Check the burner cylinder holes to see if they are clogged. The cylinder has dozens of small holes around it. They are pinhole size and may need cleaning also. I've seen as much as half of them clogged and this will affect the air flow.

A little recap, you have clean the heat exchanger, checked the vent pipes, redid the outside vents. and

Still having problems.

What does the blower wheel look like on the inducer motor? If you did or do have discharge air being suck in, the blower wheel will not look good. Do you have a picture of the impeller? you may not realize how bad it looks till you get the new one and compare.

You need to replace the burner if it's as plugged as it appears in the photo.You may find that you don't need the blower after doing that. Then you could return the blower you ordered if it's not been installed.

I may have missed it due to the length of this thread, but where's your tech? Does he really understand how to service this, or any other mod/con? If we can see these problems through the pics you've posted and from the info you've given, why hasn't he when he's been on site?

Bob Boan

You can choose to do what you want, but you cannot choose the consequences.

The new fan has been installed and the system is working. I was not here for it, but the new pro checked out the burner and said it was fine and the cleaning I did was pretty thorough, but he says the burner and HX may not last nearly as long as it should due to the junk in the HX and on the burner. I watched it through several cycles and it seems to be performing fairly close to our previous nominal state.

Had a problem on a 399 .Called tech support they told me to replace the fan. So i played with it a little bit it seamed like the fan was partly ceased . Took it apart and replaced a bearing in the fan housing. I picked up for like a buck .Put it back together . Have not had a problem sense . I own the boiler. .

Did you run a credit card in between the gaps of the heat exchanger? Or did you just vacuum out as much of the crap as you could? Did you use CLR or something to clean it as well? Did you power flush/vacuum out the condensate disposal system?

There is a LOT more to doing a full and proper service to these things than meets the eye. If it were properly maintained on a yearly basis, you wouldn't have to resort to such drastic tactics (credit cards, flushing etc) but when they go that long, the problem goes much deeper than you can see with your eyes.

ME

It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.

I used a silicon knife and followed all of the gaps twice; once after the second vacuuming and one after the flush. I used only water under hand pump pressurization for the flush. I also rechecked the whole system using an inspection cam i have, inlcuding the condensate line. Lastly, I vacuumed one more time with a nylon ended slot brush.

I hope I was fairly thorough, but I am more cognizant now of the potential problems.